/* =============================================
   Variables
   ============================================= */
:root {
  /* Color scheme */
  color-scheme: dark;
  --color-background: #0f1117; /* Dark charcoal */
  --color-surface: #131722; /* Elevated surface */
  --color-surface-2: #171b26; /* Higher elevation */
  --color-elevated: #1b2030;

  --color-text: #F2F5F9; /* Primary text */
  --color-text-muted: #B6BEC9; /* Secondary text */
  --color-white: #FFFFFF;
  --color-silver: #C0C7D1;

  /* Brand & states */
  --color-primary: #1EA7FF; /* Electric blue */
  --color-primary-600: #1495F0;
  --color-primary-700: #0C86DC;
  --color-success: #22C55E;
  --color-warning: #F59E0B;
  --color-danger:  #EF4444;

  /* Neutral grays (multi-use) */
  --gray-50:  #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  --gray-950: #0B0F16;

  /* Typography */
  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --font-display: Poppins, var(--font-sans);
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Font sizes (rem) */
  --fs-100: 0.8125rem; /* 13 */
  --fs-200: 0.875rem;  /* 14 */
  --fs-300: 0.9375rem; /* 15 */
  --fs-400: 1rem;      /* 16 */
  --fs-500: 1.125rem;  /* 18 */
  --fs-600: 1.25rem;   /* 20 */
  --fs-700: 1.5rem;    /* 24 */
  --fs-800: 1.875rem;  /* 30 */
  --fs-900: 2.25rem;   /* 36 */

  /* Line heights */
  --lh-tight: 1.2;
  --lh-snug: 1.35;
  --lh-normal: 1.6;
  --lh-loose: 1.75;

  /* Spacing scale (px) */
  --space-0: 0px;
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-56: 56px;
  --space-64: 64px;
  --space-72: 72px;
  --space-80: 80px;
  --space-96: 96px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-round: 9999px;

  /* Shadows (tuned for dark UI) */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.5);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.45);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.5);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.55);

  /* Transitions */
  --duration-fast: 120ms;
  --duration-base: 220ms;
  --duration-slow: 360ms;
  --easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --easing-emphasized: cubic-bezier(0.3, 0, 0, 1);

  /* Derived tokens */
  --color-bg: var(--color-background);
  --color-border: #232838;
  accent-color: var(--color-primary);
}

/* =============================================
   Reset / Normalize
   ============================================= */
*, *::before, *::after { box-sizing: border-box; }

html { 
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }

body {
  min-height: 100vh;
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }

input, button, textarea, select { font: inherit; color: inherit; }

button { background: none; border: none; cursor: pointer; }

/* Improve legibility for long text */
p { text-wrap: pretty; }

/* Remove default link underline (we add custom) */
a { text-decoration: none; color: inherit; }

/* =============================================
   Base Styles
   ============================================= */
body {
  background: radial-gradient(1200px 800px at 70% -10%, rgba(30,167,255,0.08), transparent 55%), var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--fs-400);
  letter-spacing: 0.01em;
}

::selection { background: var(--color-primary); color: var(--color-bg); }

/* Headings (cinematic, modern scale) */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: var(--lh-tight);
  color: var(--color-white);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.5rem, 1.6rem + 3vw, 4rem); margin-bottom: var(--space-16); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 1.3rem + 2vw, 3rem);   margin-bottom: var(--space-16); }
h3 { font-size: clamp(1.5rem, 1.1rem + 1.2vw, 2.25rem); margin-bottom: var(--space-12); }
h4 { font-size: clamp(1.25rem, 1.05rem + 0.6vw, 1.75rem); margin-bottom: var(--space-12); }
h5 { font-size: var(--fs-600); margin-bottom: var(--space-8); }
h6 { font-size: var(--fs-500); margin-bottom: var(--space-8); letter-spacing: 0; }

/* Paragraphs */
p { 
  color: var(--color-text);
  max-width: 70ch;
  margin-bottom: var(--space-16);
}

.lead { font-size: var(--fs-500); color: var(--color-text-muted); }

/* Links */
a, .link { color: var(--color-primary); text-underline-offset: 2px; }
a:hover, .link:hover { color: var(--color-primary-600); text-decoration: underline; }
a:focus-visible, .link:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }

hr { border: 0; border-top: 1px solid var(--color-border); margin: var(--space-24) 0; }

/* Lists */
ul, ol { padding-left: 1.25rem; }
ul { list-style: disc outside; }
ol { list-style: decimal outside; }
ul li, ol li { margin-block: 0.25em; }

/* =============================================
   Utilities
   ============================================= */
.container {
  width: min(100% - 2rem, 1280px);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}
.container--wide { width: min(100% - 2rem, 1440px); }

.section { padding-block: clamp(var(--space-40), 6vw, var(--space-96)); }

.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; gap: var(--space-24); }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.gap-sm { gap: var(--space-12); }
.gap-md { gap: var(--space-24); }
.gap-lg { gap: var(--space-40); }

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
}

/* Flow utility: uniform vertical rhythm */
.flow > * + * { margin-top: var(--flow-space, var(--space-16)); }

/* Screen reader only */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

.hidden { display: none !important; }

/* =============================================
   Components
   ============================================= */
/* Buttons */
.btn {
  --btn-bg: var(--color-primary);
  --btn-bg-hover: var(--color-primary-600);
  --btn-fg: var(--color-white);
  --btn-border: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 12px 20px;
  border: 1px solid var(--btn-border);
  border-radius: var(--radius-md);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-sm);
  transition: background var(--duration-base) var(--easing-standard),
              color var(--duration-base) var(--easing-standard),
              border-color var(--duration-base) var(--easing-standard),
              transform var(--duration-fast) var(--easing-standard),
              box-shadow var(--duration-base) var(--easing-standard);
}
.btn:hover { background: var(--btn-bg-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); box-shadow: var(--shadow-sm); }
.btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; transform: none; }

/* Button variants */
.btn--secondary {
  --btn-bg: var(--color-surface-2);
  --btn-bg-hover: #1d2432;
  --btn-fg: var(--color-text);
  --btn-border: var(--color-border);
}

.btn--outline {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(30,167,255,0.1);
  --btn-fg: var(--color-primary);
  --btn-border: color-mix(in oklab, var(--color-primary) 55%, transparent);
  background: transparent;
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-bg-hover: rgba(255,255,255,0.06);
  --btn-fg: var(--color-text);
  --btn-border: transparent;
  background: transparent;
}

.btn--danger { --btn-bg: var(--color-danger); --btn-bg-hover: #db2f2f; }
.btn--success { --btn-bg: var(--color-success); --btn-bg-hover: #1fa653; }

/* Inputs */
.input, input[type="text"], input[type="email"], input[type="password"], input[type="url"], input[type="tel"], input[type="search"], input[type="number"], select, textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: border-color var(--duration-base) var(--easing-standard), box-shadow var(--duration-base) var(--easing-standard), background var(--duration-base) var(--easing-standard);
}
.input::placeholder, input::placeholder, textarea::placeholder { color: var(--color-text-muted); }
.input:focus, input:focus, select:focus, textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary) 30%, transparent); }
input[disabled], select[disabled], textarea[disabled] { opacity: 0.6; cursor: not-allowed; }

label { display: inline-block; margin-bottom: var(--space-8); color: var(--color-silver); font-weight: 600; }

/* Form field grouping */
.field { margin-bottom: var(--space-20); }
.field--inline { display: grid; gap: var(--space-8); align-items: center; grid-template-columns: 1fr 2fr; }

/* Cards */
.card {
  background: linear-gradient(180deg, color-mix(in oklab, var(--color-surface) 92%, transparent), var(--color-surface));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(var(--space-20), 3vw, var(--space-32));
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}
.card__header { margin-bottom: var(--space-16); }
.card__footer { margin-top: var(--space-16); }

/* Badges/labels (lightweight) */
.badge {
  display: inline-flex; align-items: center; gap: 0.5ch;
  padding: 6px 10px;
  border-radius: var(--radius-round);
  background: rgba(30,167,255,0.12);
  color: var(--color-primary);
  border: 1px solid color-mix(in oklab, var(--color-primary) 40%, transparent);
  font-size: var(--fs-200);
  font-weight: 600;
}

/* =============================================
   Header & Footer styles (from home.css)
   ============================================= */

/* Accessibility: skip link */
.skip-link {
  position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus {
  left: 16px; top: 16px; width: auto; height: auto; padding: 8px 12px; background: var(--color-primary); color: var(--color-bg); border-radius: var(--radius-sm); z-index: 1000;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 900;
  background: color-mix(in oklab, var(--color-surface) 75%, transparent);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: saturate(1.1) blur(8px);
}
.header-inner {
  display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: var(--space-16); min-height: 64px;
}
.brand {
  font-family: var(--font-display); font-weight: 700; letter-spacing: -0.01em;
}

/* Primary nav */
.primary-nav { display: contents; }
.nav-list { display: inline-flex; gap: clamp(8px, 2vw, 24px); align-items: center; }
.nav-list a { color: var(--color-text); font-weight: 600; }
.nav-list a:hover { color: var(--color-primary); }
.nav-cta { margin-left: clamp(8px, 2vw, 20px); }

/* Burger */
.menu-toggle { display: none; width: 40px; height: 40px; border-radius: var(--radius-md); border: 1px solid var(--color-border); align-items: center; justify-content: center; }
.menu-toggle__bar { display: block; width: 18px; height: 2px; background: var(--color-text); margin: 3px 0; transition: transform var(--duration-base) var(--easing-standard); }

@media (max-width: 960px) {
  .header-inner { grid-template-columns: 1fr auto; }
  .menu-toggle { display: inline-flex; }
  .primary-nav { position: fixed; inset: 64px 0 auto 0; background: var(--color-surface); border-bottom: 1px solid var(--color-border); display: block; transform: translateY(-150%); transition: transform var(--duration-base) var(--easing-standard); padding: 12px 20px; z-index: 800; }
  .primary-nav.is-open { transform: translateY(0); }
  .primary-nav .nav-list { display: grid; gap: 8px; padding: 8px 16px; }
  .primary-nav .nav-cta { padding: 8px 16px; }
}

/* Footer */
.site-footer { border-top: 1px solid var(--color-border); background: var(--color-surface); }
.footer-inner { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: var(--space-24); padding-block: var(--space-32); }
.footer-title { font-weight: 700; font-size: var(--fs-600); }
.footer-links { display: grid; gap: 8px; }
.footer-links a { color: var(--color-text-muted); }
.footer-links a:hover { color: var(--color-primary); }
.footer-bottom { border-top: 1px solid var(--color-border); padding-block: 16px; color: var(--color-text-muted); }
@media (max-width: 900px) { .footer-inner { grid-template-columns: 1fr; } }

/* Cookie banner */
.cookie-banner { position: fixed; left: 0; right: 0; bottom: 0; background: var(--color-elevated); border-top: 1px solid var(--color-border); box-shadow: var(--shadow-md); padding-block: 12px; z-index: 950; }
.cookie-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.cookie-text { max-width: 75ch; color: var(--color-text-muted); }
.cookie-actions { display: inline-flex; gap: 8px; }
@media (max-width: 720px) {
  .cookie-inner { flex-direction: column; align-items: stretch; }
  .cookie-actions { width: 100%; }
  .cookie-actions .btn { flex: 1; }
}

/* =============================================
   Accessibility & Motion
   ============================================= */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* =============================================
   Media tweaks (responsive images/media)
   ============================================= */
img { height: auto; }
video { width: 100%; height: auto; }

/* =============================================
   Cinematic accents (subtle, optional)
   ============================================= */
.shadowed { box-shadow: var(--shadow-lg) !important; }
.backdrop-blur { backdrop-filter: saturate(1.2) blur(10px); background: color-mix(in oklab, var(--color-surface) 70%, transparent); }

/* End of base.css */